First, nobody was insulting you. Now had you just posted this:
if i wanted to set up a dual PSU so if one dies the other acts as a imediant UPS to pick up the slack sort of like a RAID PSU...
Way back in the very beginning you would have gotten answers much sooner.
This is done generally in rack mount server designs. If a PSU fails there is an immediate transfer to the second PSU. Between both PSUs and the system there is a switching network. The network consist generally of high power switching MOSFETS. Both power supplies are always on and running, however, the output of only one is directed to the system. A MOSFET is a (Metal Oxide Field Effect Transistor). Their merit is their ability to handle high current loads in switching applications and their speed.
The instant and rail of the primary PSU drops out of tolerance all rails are immediately switched to the second PSU and generally a flag is thrown causing an audible and visual alarm. The PSUs can be hot swapped.
Problem is these systems are complex and not something the home enthusiast can simply build.
The question becomes why I can't just get two identical PSUs and make a parallel configuration? This is because even two identical model PSUs will not regulate the same. Power supplies monitor their outputs on the rails and regulate according to what is there. If we placed for example two PSU 12 volt rails in parallel they would in a sense have a pissing contest trying to regulate their respective outputs. Things get more complex but that is a basic overview.
This is why many home enthusiast use one PSU for running say their GPUs and cooling and maybe the other for the system. Configurations like that are easily obtained. Even on this note, there are some pretty large beefy PSUs out there often precluding the need for these methods.